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| 1 | Comparative numerical and experimental study of two combined wind and wave energy concepts显示文摘With a successful and rapid development of offshore wind industry and increased research activities on wave energy conversion in recent years,there is an interest in investigating the technological and economic feasibility of combining offshore wind turbines(WTs)with wave energy converters(WECs).In the EU FP7 MARINA Platform project,three floating combined concepts,namely the spar torus combination(STC),the semi-submersible flap combination(SFC)and the oscillating water column(OWC)array with a wind turbine,were selected and studied in detail by numerical and experimental methods.This paper summarizes the numerical modeling and analysis of the two concepts:STC and SFC,the model tests at a 1:50 scale under simultaneous wave and wind excitation,as well as the comparison between the numerical and experimental results.Both operational and survival wind and wave conditions were considered.The numerical analysis was based on a time-domain global model using potential flow theory for hydrodynamics and blade element momentum theory(for SFC)or simplified thrust force model(for STC)for aerodynamics.Different techniques for model testing of combined wind and wave concepts were discussed with focus on modeling of wind turbines by disk or redesigned small-scale rotor and modeling of power take-off(PTO)system for wave energy conversion by pneumatic damper or hydraulic rotary damper.In order to reduce the uncertainty due to scaling,the numerical analysis was performed at model scale and both the numerical and experimental results were then up-scaled to full scale for comparison.The comparison shows that the current numerical model can well predict the responses(motions,PTO forces,power production)of the combined concepts for most of the cases.However,the linear hydrodynamic model is not adequate for the STC concept in extreme wave conditions with the torus fixed to the spar at the mean water level for which the wave slamming on the torus occurs and this requires further investigation.Moreover,based on a preliminary comparison of the displacement,the PTO system as well as the wind and wave power production,the STC concept will have a lower cost of energy as compared to the SFC concept.However,the cost of energy of either the STC or the SFC concept is higher than that of a pure floating wind turbine with the same floater. | Zhen Gao Torgeir Moan Ling Wan Constantine Michailides | 2016 | Journal of Ocean Engineering and Science2016，1，1： | 7 |
| 2 | Numerical Study of a Novel Procedure for Installing the Tower and Rotor Nacelle Assembly of Offshore Wind Turbines Based on the Inverted Pendulum Principle显示文摘Current installation costs of offshore wind turbines(OWTs) are high and profit margins in the offshore wind energy sector are low, it is thus necessary to develop installation methods that are more efficient and practical. This paper presents a numerical study(based on a global response analysis of marine operations) of a novel procedure for installing the tower and Rotor Nacelle Assemblies(RNAs) on bottom-fixed foundations of OWTs. The installation procedure is based on the inverted pendulum principle. A cargo barge is used to transport the OWT assembly in a horizontal position to the site, and a medium-size Heavy Lift Vessel(HLV) is then employed to lift and up-end the OWT assembly using a special upending frame. The main advantage of this novel procedure is that the need for a huge HLV(in terms of lifting height and capacity) is eliminated. This novel method requires that the cargo barge is in the leeward side of the HLV(which can be positioned with the best heading) during the entire installation. This is to benefit from shielding effects of the HLV on the motions of the cargo barge, so the foundations need to be installed with a specific heading based on wave direction statistics of the site and a typical installation season. Following a systematic approach based on numerical simulations of actual operations, potential critical installation activities, corresponding critical events, and limiting(response) parameters are identified. In addition, operational limits for some of the limiting parameters are established in terms of allowable limits of sea states. Following a preliminary assessment of these operational limits, the duration of the entire operation, the equipment used, and weather-and water depth-sensitivity, this novel procedure is demonstrated to be viable. | Wilson Guachamin Acero Zhen Gao Torgeir Moan | 2017 | Journal of Marine Science and Application2017，16，3： | 7 |
| 3 | Emotional symptoms in acute ischemic stroke显示文摘 | BrynjarFure Torgeir BruunWyller KnutEngedal BenteThommessen | 2006 | Int J Geriat Psychiatry2006，，4： | 2 |
| 4 | Tolerated wobble mutations in siRNAs decrease specificity, but can enhance activity in vivo显示文摘 | Torgeir Holen Svein Erik Moe Jan Gunnar | 2005 | Nucleic Acids Research2005，33，15： | 1 |
| 5 | A decade of agile methodologies:Towards explaining agile software development显示文摘 | Torgeir Dingsφyr Sridhar Nerur VenuGopal Balijepally | | 0，，06： | 1 |
| 6 | Cross-sectional deformations of rectangular hollow sections in bending:Part I-experiments显示文摘 | Frode Paulsen Torgeir Welo | 2001 | International Journal of Mechanical Sciences2001，43，1： | 1 |
| 7 | An engineering model of fatigue crack growth under variable amplitude loading显示文摘 | Huang X Torgeir M Cui W | 2008 | International Journal of Fatigue2008，30，1： | 1 |
| 8 | Atherosclerotic lesions in lymphoma survivors treated with radiotherapy显示文摘 | Torgeir Wethal B?rd Nedregaard Rune Andersen Alexander Foss? May Brit Lund Anne Günther Stein Kval?y Sophie D. Foss? John Kjekshus | 2013 | Radiotherapy and Oncology2013，，： | 1 |
| 9 | Application of numerical simulation in the bending of aluminium-alloy profiles显示文摘 | Frode Paulsen Torgeir Welo | 1996 | Journal of Material Process Technology1996，58，： | 1 |
| 10 | Application of numerical simulation in the bending of aluminium-alloy profiles显示文摘 | Frode Paulsen Torgeir Welo | 1996 | Journal of Materi- als Processing Technology1996，58，： | 1 |
| 11 | Skills Management as Knowledge Technology in a Software Consultancy Company 显示文摘 | Torgeir Dingsyr Emil Ryrvik | 2001 | Proceedings of the Learning Software Organizations Workshop Lecture Notes in Computer Science2001，96，： | 1 |
| 12 | An engineering model of fatigue crack growth under variable amplitude loading 显示文摘 | HUANG X TORGEIR M CUI W | 2008 | In- ternational Journal of Fatigue2008，30，1： | 1 |
| 13 | Application of numerical sim- ulation in the bending of aluminium alloy profiles 显示文摘 | Frode Paulsen Torgeir Welo | 1996 | Jour- nal of Materials Processing Technology1996，58，： | 1 |
| 14 | Analysis of dynamic effects relevant for the wear damage in hydraulic machines for wave energy conversion 显示文摘 | Limin Y Jorgen H Torgeir M | 2010 | Ocean Engineering2010，37，： | 1 |
| 15 | Fatigue reliability-based assessment of welded joints applying consistent fracture mechanics formulations显示文摘 | Efren Ayala-Uraga Torgeir Moan | 2006 | International Journal of Fatigue2006，29，： | 1 |
| 16 | Posunortem reviews: Purpose and approach in software engineering显示文摘 | Torgeir D | 2005 | Information and Software Technology2005，47，5： | 1 |
| 17 | Purification of cytochrome b-561: an integral heme protein of the adrenal chromaffin granule membrane 显示文摘 | Terje Silsand Torgeir Flatmark | 1974 | Biochimica et Bioph ysica Acta ( BBA ) -P rotein Structure1974，359，2： | 1 |
| 18 | Estimating navigation patterns from AIS显示文摘 | Karl G A Torgeir M | 2009 | Journal of Navigation2009，62，4： | 1 |
| 19 | Postmortem reviews:purpose and approaches in software engineering显示文摘 | Torgeir Dingsoyr | 1996 | Information and software Technology1996，，47： | 1 |
| 20 | A probabilistic assessment of design sloshing pressure time histories in LNG tanks显示文摘 | Mateusz Graczy Torgeir Moan | 2008 | Ocean Engineering2008，35，89： | 1 |
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